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      Scientific American August 06, 1870

      The New Patent Laws--Important Changes Affecting American and Foreign Manufacturers--Free Trade in Patents Now Fully Established

      • August 6, 1870

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      More in the August 06, 1870 issue of Scientific American
      • Correspondence- August 6, 1870
      • Official List of Patents- August 6, 1870
      • Depreciation of American Vitality
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